From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964996Ab3DPKQh (ORCPT ); Tue, 16 Apr 2013 06:16:37 -0400 Received: from mailout02.c08.mtsvc.net ([205.186.168.190]:50225 "EHLO mailout02.c08.mtsvc.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964961Ab3DPKQe (ORCPT ); Tue, 16 Apr 2013 06:16:34 -0400 From: Peter Hurley To: Greg Kroah-Hartman Cc: Jiri Slaby , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Hurley Subject: [PATCH 6/7] tty: Clarify multiple-references comment in TIOCSETD ioctl Date: Tue, 16 Apr 2013 06:15:55 -0400 Message-Id: <1366107356-7699-6-git-send-email-peter@hurleysoftware.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1366107356-7699-1-git-send-email-peter@hurleysoftware.com> References: <20130415201411.GA27360@kroah.com> <1366107356-7699-1-git-send-email-peter@hurleysoftware.com> X-Authenticated-User: 125194 peter@hurleysoftware.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Peter Hurley --- drivers/tty/tty_ldisc.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index 84ba790..9725c94 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -567,13 +567,15 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) tty_ldisc_restore(tty, old_ldisc); } - /* At this point we hold a reference to the new ldisc and a - a reference to the old ldisc. If we ended up flipping back - to the existing ldisc we have two references to it */ - if (tty->ldisc->ops->num != old_ldisc->ops->num && tty->ops->set_ldisc) tty->ops->set_ldisc(tty); + /* At this point we hold a reference to the new ldisc and a + reference to the old ldisc, or we hold two references to + the old ldisc (if it was restored as part of error cleanup + above). In either case, releasing a single reference from + the old ldisc is correct. */ + tty_ldisc_put(old_ldisc); /* -- 1.8.1.2